Study of Sangihe-Filipino fishermen activity in Bitung City, North Sulawesi, Indonesia - Thamin, Aswan; Program Magister Ilmu Perairan, Pascasarjana, Universitas Sam Ratulangi, Jln. Kampus Unsrat Kleak, Manado 95115, Sulawesi Utara, Indonesia (Master Program of Aquatic Sciences, 2013)